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Publisher DOI: 10.3390/ijerph191610006
Title: Chemical and microbial leaching of valuable metals from PCBs and tantalum capacitors of spent mobile phones
Language: English
Authors: Sikander, Asma 
Kelly, Steven 
Kuchta, Kerstin  
Sievers, Anika 
Willner, Thomas 
Hursthouse, Andrew S. 
Keywords: bioleaching; tantalum; WEEE; acidophiles; waste management; green technology
Issue Date: 13-Aug-2022
Publisher: Multidisciplinary Digital Publishing Institute
Source: International Journal of Environmental Research and Public Health 19 (16): 10006 (2022)
Abstract (english): 
We compared chemical and microbial leaching for multi-metal extraction from printed circuit boards (PCBs) and tantalum capacitor scrap. A mixed consortium of acidophiles and heterotrophic fungal strains were used in the experiments and compared to chemical leaching using specific acids (sulfuric, citric and oxalic acids). Under optimum conditions, 100% extraction efficiency of Cu, and nearly 85% of Zn, Fe, Al and Ni were achieved from PCB and tantalum capacitor scrap samples using sulfuric acid. The mixed consortium of acidophiles successfully mobilized, Ni and Cu (99% and 96%, respectively) while Fe, Zn, Al and Mn reached an extraction yield of 89, 77, 70 and 43%, respectively, from the PCB samples. For the tantalum capacitor samples, acidophiles mobilized 92% Cu, 88% Ni, 78% Fe, 77% Al, 70% Zn and 57% Mn. Metal mobilization from PCBs and tantalum capacitor scrap by A. niger filtrate showed efficient solubilization of Cu, Fe, Al, Mn, Ni, Pb and Zn at an efficiency of 52, 29, 75, 5, 61, 21 and 35% from PCB samples and 61, 25, 69, 23, 68, 15 and 45% from tantalum capacitor samples, respectively. Microbial leaching proved viable as a method to extract base metals but was less specific for tantalum and precious metals in electronic waste. The implications of these results for further processing of waste electronic and electrical equipment (WEEE) are considered in potential hybrid treatment strategies.
DOI: 10.15480/882.4567
ISSN: 1660-4601
Journal: International journal of environmental research and public health 
Other Identifiers: doi: 10.3390/ijerph191610006
Institute: Circular Resource Engineering and Management V-11 
Document Type: Article
Project: European network for innovative recovery strategies of rare earth and other critical metals from electric and electronic waste 
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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